Use foreach with sed in a bash script Post: 303013142

Sponsored Content

Top Forums UNIX for Beginners Questions & Answers Use foreach with sed in a bash script Post 303013142 by RudiC on Thursday 15th of February 2018 02:25:04 PM

02-15-2018

Registered User

Welcome to the forum.

First comment on your title: there's no foreach in bash - it's from csh. bash provides similar but not identical commands.

Now to your specification. Please form sentences in plain English, carefully, detailedly, and completely. And, make sure the written request and sample code are consistent (you want "to grab the value 66.0000000E+00", but your sed scripts deliver -9700000 and 0.0000000E+00). Describe the problem and desired result. Add your (failed?) attempts: the steps you have taken and the tools you have used.

Let me try to paraphrase what I more guessed than understood from what you said above:
We have an input file with a five line general header, and followed by multiple records, each with a two line sub header, the keyword 1NAME in an extra line, and three data lines of five floating point numbers, i.e. 15 numbers.
From every record, we need to extract one certain number pointed to by a variable or an algorithm (to be defined).

Now there's some questions to be asked:
- Are any (sub) header data relevant and need to be taken into accont or passed back?
- how will the pointer be passed to this script / tool / program?
- are data from every single record to be extracted?
- how would the named algorithm be defined?
- what should be passed back to the caller?

Last edited by RudiC; 02-15-2018 at 05:33 PM.. Reason: improve phrasing

This User Gave Thanks to RudiC For This Post:

RudiC

View Public Profile for RudiC

Find all posts by RudiC

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Using sed with a foreach loop

So I am back again beating my head against the wall with a shell script and getting a headache! I want to change each year in a file (1980, 1981, 1982, 1983, etc.) to the same year followed by a tab. The input is "blah blah (1980) blah blah". I want to get "blah blah (1980 ) blah blah"....

2. Shell Programming and Scripting

for / foreach syntax issues (in bash or tcsh)

So I am new to unix, and actually anything outside drag and drop with the mouse (been learning for about a week so far) . I have been using the foreach command in tcsh because I am working on a group of files. Basically what I need is to insert part of the filename as the first line in the file....

3. Shell Programming and Scripting

XML- Sed || Awk Bash script... Help!

Hi ! I'm working into my first bash script to make some xml modification and it's going to make me crazy lol .. so I decide to try into this forum to take some ideas from people that really know about this! This is my situation I've and xml file with a lots of positional values with another tags...

4. Shell Programming and Scripting

foreach in bash (simple)

#!/bin/bash foreach valuex ( word1 word2 word3 word4 ) echo $valuex done the output should be: word1 word2 word3 word4 HOW DO I MAKE THIS WORK?

5. UNIX for Dummies Questions & Answers

Shell script foreach help

I am writing a shell script to uncompress files in a directory, then call a Perl script to search the files for given terms, store those terms in a different output file , and compress the output. I get a syntax error with my use of foreach. Below is my script. #!/bin/csh -fxv if (!...

6. Shell Programming and Scripting

sed not working in a bash script

Hi friends, I have two files - input and commands I want to read the input and replace a value in it with the contents in commands. My script is like this. Instead of printing the value in the commands file, it is simply printing $cmd in the output file. Any pointers are highly...

7. Shell Programming and Scripting

Text manipulation with sed/awk in a bash script

Guys, I have a variable in a script that I want to transform to into something else Im hoping you guys can help. It doesn't have to use sed/awk but I figured these would be the simplest. DATE=20160120 I'd like to transform $DATE into "01-20-16" and move it into a new variable called...

8. Shell Programming and Scripting

sed problems - Bash Script

Hi I keep getting the following error sed: -e expression #1, char 32: unterminated `s' command sed: -e expression #1, char 35: unterminated `s' command sed: -e expression #1, char 35: unterminated `s' command whenever I use the following bash script #! /bin/bash...

9. Shell Programming and Scripting

Replacing filename with sed in bash script

I need to cat two files with similar names. I am using the following script: #!/bin/bash if ] then file=$1 file2="${file%R1.fastq}R2.fastq" echo fetching data from R2 file ... sleep 3 cat $file $file2 > infile else echo "Input_file passed...

10. Shell Programming and Scripting

Need bash script to use a sed command as a variable

I need to be able to use a sed command as a variable in a bash script. I have the sed command that almost works the way I want it. the command is sed -n '/inet/,/}/p' config.boot This gets me this result: inet 192.168.1.245 } I need to get the IP address into a variable so I...

LEARN ABOUT DEBIAN

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

Linux								       Epoch								     Linux

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Using sed with a foreach loop

Discussion started by: Peggy White

2. Shell Programming and Scripting

for / foreach syntax issues (in bash or tcsh)

Discussion started by: thepolypore

3. Shell Programming and Scripting

XML- Sed || Awk Bash script... Help!

Discussion started by: juampal

4. Shell Programming and Scripting

foreach in bash (simple)

Discussion started by: ajp7701